Comments added. Client generated using NSwagStudio.

QRBee.Core/Client/APIClient.nswag

@@ -0,0 +1,102 @@
+{
+  "runtime": "Net60",
+  "defaultVariables": null,
+  "documentGenerator": {
+    "fromDocument": {
+      "json": "{\r\n  \"openapi\": \"3.0.1\",\r\n  \"info\": {\r\n    \"title\": \"QRBee.Api\",\r\n    \"version\": \"1.0\"\r\n  },\r\n  \"paths\": {\r\n    \"/api/QRBee/Register\": {\r\n      \"post\": {\r\n        \"tags\": [\r\n          \"QRBee\"\r\n        ],\r\n        \"requestBody\": {\r\n          \"content\": {\r\n            \"application/json\": {\r\n              \"schema\": {\r\n                \"$ref\": \"#/components/schemas/RegistrationRequest\"\r\n              }\r\n            },\r\n            \"text/json\": {\r\n              \"schema\": {\r\n                \"$ref\": \"#/components/schemas/RegistrationRequest\"\r\n              }\r\n            },\r\n            \"application/*+json\": {\r\n              \"schema\": {\r\n                \"$ref\": \"#/components/schemas/RegistrationRequest\"\r\n              }\r\n            }\r\n          }\r\n        },\r\n        \"responses\": {\r\n          \"200\": {\r\n            \"description\": \"Success\",\r\n            \"content\": {\r\n              \"text/plain\": {\r\n                \"schema\": {\r\n                  \"$ref\": \"#/components/schemas/RegistrationResponse\"\r\n                }\r\n              },\r\n              \"application/json\": {\r\n                \"schema\": {\r\n                  \"$ref\": \"#/components/schemas/RegistrationResponse\"\r\n                }\r\n              },\r\n              \"text/json\": {\r\n                \"schema\": {\r\n                  \"$ref\": \"#/components/schemas/RegistrationResponse\"\r\n                }\r\n              }\r\n            }\r\n          }\r\n        }\r\n      }\r\n    }\r\n  },\r\n  \"components\": {\r\n    \"schemas\": {\r\n      \"RegistrationRequest\": {\r\n        \"type\": \"object\",\r\n        \"properties\": {\r\n          \"name\": {\r\n            \"type\": \"string\",\r\n            \"nullable\": true\r\n          },\r\n          \"email\": {\r\n            \"type\": \"string\",\r\n            \"nullable\": true\r\n          },\r\n          \"dateOfBirth\": {\r\n            \"type\": \"string\",\r\n            \"nullable\": true\r\n          },\r\n          \"certificateRequest\": {\r\n            \"type\": \"string\",\r\n            \"nullable\": true\r\n          },\r\n          \"registerAsMerchant\": {\r\n            \"type\": \"boolean\"\r\n          }\r\n        },\r\n        \"additionalProperties\": false\r\n      },\r\n      \"RegistrationResponse\": {\r\n        \"type\": \"object\",\r\n        \"properties\": {\r\n          \"clientId\": {\r\n            \"type\": \"string\",\r\n            \"nullable\": true\r\n          },\r\n          \"certificate\": {\r\n            \"type\": \"string\",\r\n            \"nullable\": true\r\n          }\r\n        },\r\n        \"additionalProperties\": false\r\n      }\r\n    }\r\n  }\r\n}",
+      "url": "http://redocly.github.io/redoc/openapi.yaml",
+      "output": null,
+      "newLineBehavior": "Auto"
+    }
+  },
+  "codeGenerators": {
+    "openApiToCSharpClient": {
+      "clientBaseClass": null,
+      "configurationClass": null,
+      "generateClientClasses": true,
+      "generateClientInterfaces": false,
+      "clientBaseInterface": null,
+      "injectHttpClient": true,
+      "disposeHttpClient": true,
+      "protectedMethods": [],
+      "generateExceptionClasses": true,
+      "exceptionClass": "ApiException",
+      "wrapDtoExceptions": true,
+      "useHttpClientCreationMethod": false,
+      "httpClientType": "System.Net.Http.HttpClient",
+      "useHttpRequestMessageCreationMethod": false,
+      "useBaseUrl": true,
+      "generateBaseUrlProperty": true,
+      "generateSyncMethods": false,
+      "generatePrepareRequestAndProcessResponseAsAsyncMethods": false,
+      "exposeJsonSerializerSettings": false,
+      "clientClassAccessModifier": "public",
+      "typeAccessModifier": "public",
+      "generateContractsOutput": false,
+      "contractsNamespace": null,
+      "contractsOutputFilePath": null,
+      "parameterDateTimeFormat": "s",
+      "parameterDateFormat": "yyyy-MM-dd",
+      "generateUpdateJsonSerializerSettingsMethod": true,
+      "useRequestAndResponseSerializationSettings": false,
+      "serializeTypeInformation": false,
+      "queryNullValue": "",
+      "className": "{controller}Client",
+      "operationGenerationMode": "MultipleClientsFromOperationId",
+      "additionalNamespaceUsages": [
+        "QRBee.Core.Data"
+      ],
+      "additionalContractNamespaceUsages": [],
+      "generateOptionalParameters": false,
+      "generateJsonMethods": false,
+      "enforceFlagEnums": false,
+      "parameterArrayType": "System.Collections.Generic.IEnumerable",
+      "parameterDictionaryType": "System.Collections.Generic.IDictionary",
+      "responseArrayType": "System.Collections.Generic.ICollection",
+      "responseDictionaryType": "System.Collections.Generic.IDictionary",
+      "wrapResponses": false,
+      "wrapResponseMethods": [],
+      "generateResponseClasses": true,
+      "responseClass": "SwaggerResponse",
+      "namespace": "QRBee.Core.Client",
+      "requiredPropertiesMustBeDefined": true,
+      "dateType": "System.DateTimeOffset",
+      "jsonConverters": null,
+      "anyType": "object",
+      "dateTimeType": "System.DateTimeOffset",
+      "timeType": "System.TimeSpan",
+      "timeSpanType": "System.TimeSpan",
+      "arrayType": "System.Collections.Generic.ICollection",
+      "arrayInstanceType": "System.Collections.ObjectModel.Collection",
+      "dictionaryType": "System.Collections.Generic.IDictionary",
+      "dictionaryInstanceType": "System.Collections.Generic.Dictionary",
+      "arrayBaseType": "System.Collections.ObjectModel.Collection",
+      "dictionaryBaseType": "System.Collections.Generic.Dictionary",
+      "classStyle": "Poco",
+      "jsonLibrary": "NewtonsoftJson",
+      "generateDefaultValues": true,
+      "generateDataAnnotations": true,
+      "excludedTypeNames": [],
+      "excludedParameterNames": [],
+      "handleReferences": false,
+      "generateImmutableArrayProperties": false,
+      "generateImmutableDictionaryProperties": false,
+      "jsonSerializerSettingsTransformationMethod": null,
+      "inlineNamedArrays": false,
+      "inlineNamedDictionaries": false,
+      "inlineNamedTuples": true,
+      "inlineNamedAny": false,
+      "generateDtoTypes": false,
+      "generateOptionalPropertiesAsNullable": false,
+      "generateNullableReferenceTypes": false,
+      "templateDirectory": null,
+      "typeNameGeneratorType": null,
+      "propertyNameGeneratorType": null,
+      "enumNameGeneratorType": null,
+      "serviceHost": null,
+      "serviceSchemes": null,
+      "output": null,
+      "newLineBehavior": "Auto"
+    }
+  }
+}

QRBee.Core/Client/Client.cs

@@ -0,0 +1,282 @@
+//----------------------
+// <auto-generated>
+//     Generated using the NSwag toolchain v13.15.5.0 (NJsonSchema v10.6.6.0 (Newtonsoft.Json v13.0.0.0)) (http://NSwag.org)
+// </auto-generated>
+//----------------------
+
+using QRBee.Core.Data;
+
+#pragma warning disable 108 // Disable "CS0108 '{derivedDto}.ToJson()' hides inherited member '{dtoBase}.ToJson()'. Use the new keyword if hiding was intended."
+#pragma warning disable 114 // Disable "CS0114 '{derivedDto}.RaisePropertyChanged(String)' hides inherited member 'dtoBase.RaisePropertyChanged(String)'. To make the current member override that implementation, add the override keyword. Otherwise add the new keyword."
+#pragma warning disable 472 // Disable "CS0472 The result of the expression is always 'false' since a value of type 'Int32' is never equal to 'null' of type 'Int32?'
+#pragma warning disable 1573 // Disable "CS1573 Parameter '...' has no matching param tag in the XML comment for ...
+#pragma warning disable 1591 // Disable "CS1591 Missing XML comment for publicly visible type or member ..."
+#pragma warning disable 8073 // Disable "CS8073 The result of the expression is always 'false' since a value of type 'T' is never equal to 'null' of type 'T?'"
+#pragma warning disable 3016 // Disable "CS3016 Arrays as attribute arguments is not CLS-compliant"
+
+namespace QRBee.Core.Client
+{
+    using System = global::System;
+
+    [System.CodeDom.Compiler.GeneratedCode("NSwag", "13.15.5.0 (NJsonSchema v10.6.6.0 (Newtonsoft.Json v13.0.0.0))")]
+    public partial class Client
+    {
+        private string _baseUrl = "";
+        private System.Net.Http.HttpClient _httpClient;
+        private System.Lazy<Newtonsoft.Json.JsonSerializerSettings> _settings;
+
+        public Client(string baseUrl, System.Net.Http.HttpClient httpClient)
+        {
+            BaseUrl = baseUrl;
+            _httpClient = httpClient;
+            _settings = new System.Lazy<Newtonsoft.Json.JsonSerializerSettings>(CreateSerializerSettings);
+        }
+
+        private Newtonsoft.Json.JsonSerializerSettings CreateSerializerSettings()
+        {
+            var settings = new Newtonsoft.Json.JsonSerializerSettings();
+            UpdateJsonSerializerSettings(settings);
+            return settings;
+        }
+
+        public string BaseUrl
+        {
+            get { return _baseUrl; }
+            set { _baseUrl = value; }
+        }
+
+        protected Newtonsoft.Json.JsonSerializerSettings JsonSerializerSettings { get { return _settings.Value; } }
+
+        partial void UpdateJsonSerializerSettings(Newtonsoft.Json.JsonSerializerSettings settings);
+
+        partial void PrepareRequest(System.Net.Http.HttpClient client, System.Net.Http.HttpRequestMessage request, string url);
+        partial void PrepareRequest(System.Net.Http.HttpClient client, System.Net.Http.HttpRequestMessage request, System.Text.StringBuilder urlBuilder);
+        partial void ProcessResponse(System.Net.Http.HttpClient client, System.Net.Http.HttpResponseMessage response);
+
+        /// <returns>Success</returns>
+        /// <exception cref="ApiException">A server side error occurred.</exception>
+        public virtual System.Threading.Tasks.Task<RegistrationResponse> RegisterAsync(RegistrationRequest body)
+        {
+            return RegisterAsync(body, System.Threading.CancellationToken.None);
+        }
+
+        /// <param name="cancellationToken">A cancellation token that can be used by other objects or threads to receive notice of cancellation.</param>
+        /// <returns>Success</returns>
+        /// <exception cref="ApiException">A server side error occurred.</exception>
+        public virtual async System.Threading.Tasks.Task<RegistrationResponse> RegisterAsync(RegistrationRequest body, System.Threading.CancellationToken cancellationToken)
+        {
+            var urlBuilder_ = new System.Text.StringBuilder();
+            urlBuilder_.Append(BaseUrl != null ? BaseUrl.TrimEnd('/') : "").Append("/api/QRBee/Register");
+
+            var client_ = _httpClient;
+            var disposeClient_ = false;
+            try
+            {
+                using (var request_ = new System.Net.Http.HttpRequestMessage())
+                {
+                    var content_ = new System.Net.Http.StringContent(Newtonsoft.Json.JsonConvert.SerializeObject(body, _settings.Value));
+                    content_.Headers.ContentType = System.Net.Http.Headers.MediaTypeHeaderValue.Parse("application/json");
+                    request_.Content = content_;
+                    request_.Method = new System.Net.Http.HttpMethod("POST");
+                    request_.Headers.Accept.Add(System.Net.Http.Headers.MediaTypeWithQualityHeaderValue.Parse("text/plain"));
+
+                    PrepareRequest(client_, request_, urlBuilder_);
+
+                    var url_ = urlBuilder_.ToString();
+                    request_.RequestUri = new System.Uri(url_, System.UriKind.RelativeOrAbsolute);
+
+                    PrepareRequest(client_, request_, url_);
+
+                    var response_ = await client_.SendAsync(request_, System.Net.Http.HttpCompletionOption.ResponseHeadersRead, cancellationToken).ConfigureAwait(false);
+                    var disposeResponse_ = true;
+                    try
+                    {
+                        var headers_ = System.Linq.Enumerable.ToDictionary(response_.Headers, h_ => h_.Key, h_ => h_.Value);
+                        if (response_.Content != null && response_.Content.Headers != null)
+                        {
+                            foreach (var item_ in response_.Content.Headers)
+                                headers_[item_.Key] = item_.Value;
+                        }
+
+                        ProcessResponse(client_, response_);
+
+                        var status_ = (int)response_.StatusCode;
+                        if (status_ == 200)
+                        {
+                            var objectResponse_ = await ReadObjectResponseAsync<RegistrationResponse>(response_, headers_, cancellationToken).ConfigureAwait(false);
+                            if (objectResponse_.Object == null)
+                            {
+                                throw new ApiException("Response was null which was not expected.", status_, objectResponse_.Text, headers_, null);
+                            }
+                            return objectResponse_.Object;
+                        }
+                        else
+                        {
+                            var responseData_ = response_.Content == null ? null : await response_.Content.ReadAsStringAsync().ConfigureAwait(false);
+                            throw new ApiException("The HTTP status code of the response was not expected (" + status_ + ").", status_, responseData_, headers_, null);
+                        }
+                    }
+                    finally
+                    {
+                        if (disposeResponse_)
+                            response_.Dispose();
+                    }
+                }
+            }
+            finally
+            {
+                if (disposeClient_)
+                    client_.Dispose();
+            }
+        }
+
+        protected struct ObjectResponseResult<T>
+        {
+            public ObjectResponseResult(T responseObject, string responseText)
+            {
+                this.Object = responseObject;
+                this.Text = responseText;
+            }
+
+            public T Object { get; }
+
+            public string Text { get; }
+        }
+
+        public bool ReadResponseAsString { get; set; }
+
+        protected virtual async System.Threading.Tasks.Task<ObjectResponseResult<T>> ReadObjectResponseAsync<T>(System.Net.Http.HttpResponseMessage response, System.Collections.Generic.IReadOnlyDictionary<string, System.Collections.Generic.IEnumerable<string>> headers, System.Threading.CancellationToken cancellationToken)
+        {
+            if (response == null || response.Content == null)
+            {
+                return new ObjectResponseResult<T>(default(T), string.Empty);
+            }
+
+            if (ReadResponseAsString)
+            {
+                var responseText = await response.Content.ReadAsStringAsync().ConfigureAwait(false);
+                try
+                {
+                    var typedBody = Newtonsoft.Json.JsonConvert.DeserializeObject<T>(responseText, JsonSerializerSettings);
+                    return new ObjectResponseResult<T>(typedBody, responseText);
+                }
+                catch (Newtonsoft.Json.JsonException exception)
+                {
+                    var message = "Could not deserialize the response body string as " + typeof(T).FullName + ".";
+                    throw new ApiException(message, (int)response.StatusCode, responseText, headers, exception);
+                }
+            }
+            else
+            {
+                try
+                {
+                    using (var responseStream = await response.Content.ReadAsStreamAsync().ConfigureAwait(false))
+                    using (var streamReader = new System.IO.StreamReader(responseStream))
+                    using (var jsonTextReader = new Newtonsoft.Json.JsonTextReader(streamReader))
+                    {
+                        var serializer = Newtonsoft.Json.JsonSerializer.Create(JsonSerializerSettings);
+                        var typedBody = serializer.Deserialize<T>(jsonTextReader);
+                        return new ObjectResponseResult<T>(typedBody, string.Empty);
+                    }
+                }
+                catch (Newtonsoft.Json.JsonException exception)
+                {
+                    var message = "Could not deserialize the response body stream as " + typeof(T).FullName + ".";
+                    throw new ApiException(message, (int)response.StatusCode, string.Empty, headers, exception);
+                }
+            }
+        }
+
+        private string ConvertToString(object value, System.Globalization.CultureInfo cultureInfo)
+        {
+            if (value == null)
+            {
+                return "";
+            }
+
+            if (value is System.Enum)
+            {
+                var name = System.Enum.GetName(value.GetType(), value);
+                if (name != null)
+                {
+                    var field = System.Reflection.IntrospectionExtensions.GetTypeInfo(value.GetType()).GetDeclaredField(name);
+                    if (field != null)
+                    {
+                        var attribute = System.Reflection.CustomAttributeExtensions.GetCustomAttribute(field, typeof(System.Runtime.Serialization.EnumMemberAttribute))
+                            as System.Runtime.Serialization.EnumMemberAttribute;
+                        if (attribute != null)
+                        {
+                            return attribute.Value != null ? attribute.Value : name;
+                        }
+                    }
+
+                    var converted = System.Convert.ToString(System.Convert.ChangeType(value, System.Enum.GetUnderlyingType(value.GetType()), cultureInfo));
+                    return converted == null ? string.Empty : converted;
+                }
+            }
+            else if (value is bool)
+            {
+                return System.Convert.ToString((bool)value, cultureInfo).ToLowerInvariant();
+            }
+            else if (value is byte[])
+            {
+                return System.Convert.ToBase64String((byte[])value);
+            }
+            else if (value.GetType().IsArray)
+            {
+                var array = System.Linq.Enumerable.OfType<object>((System.Array)value);
+                return string.Join(",", System.Linq.Enumerable.Select(array, o => ConvertToString(o, cultureInfo)));
+            }
+
+            var result = System.Convert.ToString(value, cultureInfo);
+            return result == null ? "" : result;
+        }
+    }
+
+
+
+
+
+    [System.CodeDom.Compiler.GeneratedCode("NSwag", "13.15.5.0 (NJsonSchema v10.6.6.0 (Newtonsoft.Json v13.0.0.0))")]
+    public partial class ApiException : System.Exception
+    {
+        public int StatusCode { get; private set; }
+
+        public string Response { get; private set; }
+
+        public System.Collections.Generic.IReadOnlyDictionary<string, System.Collections.Generic.IEnumerable<string>> Headers { get; private set; }
+
+        public ApiException(string message, int statusCode, string response, System.Collections.Generic.IReadOnlyDictionary<string, System.Collections.Generic.IEnumerable<string>> headers, System.Exception innerException)
+            : base(message + "\n\nStatus: " + statusCode + "\nResponse: \n" + ((response == null) ? "(null)" : response.Substring(0, response.Length >= 512 ? 512 : response.Length)), innerException)
+        {
+            StatusCode = statusCode;
+            Response = response;
+            Headers = headers;
+        }
+
+        public override string ToString()
+        {
+            return string.Format("HTTP Response: \n\n{0}\n\n{1}", Response, base.ToString());
+        }
+    }
+
+    [System.CodeDom.Compiler.GeneratedCode("NSwag", "13.15.5.0 (NJsonSchema v10.6.6.0 (Newtonsoft.Json v13.0.0.0))")]
+    public partial class ApiException<TResult> : ApiException
+    {
+        public TResult Result { get; private set; }
+
+        public ApiException(string message, int statusCode, string response, System.Collections.Generic.IReadOnlyDictionary<string, System.Collections.Generic.IEnumerable<string>> headers, TResult result, System.Exception innerException)
+            : base(message, statusCode, response, headers, innerException)
+        {
+            Result = result;
+        }
+    }
+
+}
+
+#pragma warning restore 1591
+#pragma warning restore 1573
+#pragma warning restore 472
+#pragma warning restore 114
+#pragma warning restore 108
+#pragma warning restore 3016

QRBee.Core/ClientCardData.cs

@@ -39,6 +39,11 @@
             set;
         }
 
+        /// <summary>
+        /// Convert ClientCardData to string to be used as a source for encryption.
+        /// WARNING: this should always be encrypted and never transmitted in clear text form.
+        /// </summary>
+        /// <returns>Converted string</returns>
         public string AsString() => $"{CardNumber}|{ExpirationDateMMYY}|{ValidFrom}|{CardHolderName}|{CVC}|{IssueNo}";
 
     }

QRBee.Core/Data/ClientToMerchantResponse.cs

@@ -32,8 +32,18 @@
             set;
         }
 
+        /// <summary>
+        /// Convert ClientToMerchantResponse to string to be used as QR Code source (along with client signature)
+        /// </summary>
+        /// <returns> Converted string</returns>
         public string AsString() => $"{ClientId}|{TimeStampUTC:O}|{Request.AsString()}";
 
+        /// <summary>
+        /// Convert from string
+        /// </summary>
+        /// <param name="input">A string representation of ClientToMerchantResponse</param>
+        /// <returns>Converted string</returns>
+        /// <exception cref="ApplicationException">Thrown if the input string is incorrect</exception>
         public static ClientToMerchantResponse FromString(string input)
         {
             var s = input.Split('|');

QRBee.Core/Data/MerchantToClientRequest.cs

@@ -34,8 +34,18 @@ namespace QRBee.Core.Data
             set;
         }
 
+        /// <summary>
+        /// Convert MerchantToClientRequest to string to be used as QR Code source (along with merchant signature)
+        /// </summary>
+        /// <returns>String conversion</returns>
         public string AsString() => $"{TransactionId}|{Name}|{Amount.ToString("0.00", CultureInfo.InvariantCulture)}|{TimeStampUTC:O}";
 
+        /// <summary>
+        /// Convert from string
+        /// </summary>
+        /// <param name="input"> A string representation of MerchantToClientRequest</param>
+        /// <returns> Converted string</returns>
+        /// <exception cref="ApplicationException">Thrown if the input string is incorrect</exception>
         public static MerchantToClientRequest FromString(string input)
         {
             var s = input.Split('|');

QRBee.Core/Data/PaymentRequest.cs

@@ -9,6 +9,10 @@
             set;
         }
 
+        /// <summary>
+        /// Convert PaymentRequest to string
+        /// </summary>
+        /// <returns>Converted string</returns>
         public string AsString() => Request.AsString();
 
     }

QRBee.Core/Data/PaymentResponse.cs

@@ -15,6 +15,10 @@
             set;
         }
 
+        /// <summary>
+        /// Convert PaymentResponse to string to be encrypted and transmitted back to merchant
+        /// </summary>
+        /// <returns>Converted string</returns>
         public string AsString() => $"{ServerTransactionId}|{PaymentRequest.AsString()}";
     }
 }

QRBee.Core/QRBee.Core.csproj

@@ -6,4 +6,8 @@
 	  <LangVersion>latest</LangVersion>
   </PropertyGroup>
 
+  <ItemGroup>
+    <PackageReference Include="Newtonsoft.Json" Version="13.0.1" />
+  </ItemGroup>
+
 </Project>

QRBee/QRBee/Services/IDataStore.cs

@@ -4,6 +4,10 @@ using System.Threading.Tasks;
 
 namespace QRBee.Services
 {
+    /// <summary>
+    /// Database interface
+    /// </summary>
+    /// <typeparam name="T"></typeparam>
     public interface IDataStore<T>
     {
         Task<bool> AddItemAsync(T item);

QRBee/QRBee/Services/IQRScanner.cs

@@ -5,8 +5,15 @@ using System.Threading.Tasks;
 
 namespace QRBee.Services
 {
+    /// <summary>
+    /// Interface for QR scanning
+    /// </summary>
     public interface IQRScanner
     {
+        /// <summary>
+        /// Scan QR Code
+        /// </summary>
+        /// <returns></returns>
         Task<string> ScanQR();
     }
 }

QRBee/QRBee/ViewModels/ClientPageViewModel.cs

@@ -92,6 +92,10 @@ namespace QRBee.ViewModels
             }
         }
 
+        /// <summary>
+        /// Reaction on GenerateQR button clicked
+        /// </summary>
+        /// <param name="obj"></param>
         public async void OnGenerateQrClicked(object obj)
         {
 

QRBee/QRBee/ViewModels/LoginViewModel.cs

@@ -12,24 +12,30 @@ namespace QRBee.ViewModels
         {
             get;
         }
-
         public Command RegisterCommand
         {
             get;
         }
-
         public LoginViewModel()
         {
             LoginCommand = new Command(OnLoginClicked);
             RegisterCommand = new Command(OnRegisterClicked);
         }
 
+        /// <summary>
+        /// Reaction on Login button
+        /// </summary>
+        /// <param name="obj"></param>
         private async void OnLoginClicked(object obj)
         {
             // Prefixing with `//` switches to a different navigation stack instead of pushing to the active one
             await Shell.Current.GoToAsync($"//{nameof(MainPage)}");
         }
 
+        /// <summary>
+        /// Reaction on Register button
+        /// </summary>
+        /// <param name="obj"></param>
         private async void OnRegisterClicked(object obj)
         {
             await Shell.Current.GoToAsync($"{nameof(RegisterPage)}");

QRBee/QRBee/ViewModels/MerchantPageViewModel.cs

@@ -92,6 +92,10 @@ namespace QRBee.ViewModels
             }
         }
 
+        /// <summary>
+        /// Reaction on Generate QR code button
+        /// </summary>
+        /// <param name="obj"></param>
         public async void OnGenerateQrClicked(object obj)
         {
             var trans = new MerchantToClientRequest

QRBeeApi/Controllers/WeatherForecastController.cs

@@ -1,33 +0,0 @@
-using Microsoft.AspNetCore.Mvc;
-
-namespace QRBeeApi.Controllers
-{
-    [ApiController]
-    [Route("[controller]")]
-    public class WeatherForecastController : ControllerBase
-    {
-        private static readonly string[] Summaries = new[]
-        {
-        "Freezing", "Bracing", "Chilly", "Cool", "Mild", "Warm", "Balmy", "Hot", "Sweltering", "Scorching"
-    };
-
-        private readonly ILogger<WeatherForecastController> _logger;
-
-        public WeatherForecastController(ILogger<WeatherForecastController> logger)
-        {
-            _logger = logger;
-        }
-
-        [HttpGet(Name = "GetWeatherForecast")]
-        public IEnumerable<WeatherForecast> Get()
-        {
-            return Enumerable.Range(1, 5).Select(index => new WeatherForecast
-            {
-                Date = DateTime.Now.AddDays(index),
-                TemperatureC = Random.Shared.Next(-20, 55),
-                Summary = Summaries[Random.Shared.Next(Summaries.Length)]
-            })
-            .ToArray();
-        }
-    }
-}

QRBeeApi/Services/Database/IStorage.cs

@@ -1,9 +1,22 @@
 namespace QRBee.Api.Services.Database
 {
+    /// <summary>
+    /// Database interface
+    /// </summary>
     public interface IStorage
     {
-
+        /// <summary>
+        /// Insert userInfo into database
+        /// </summary>
+        /// <param name="info"> Information to be inserted</param>
+        /// <returns></returns>
         Task<string> PutUserInfo(UserInfo info);
+
+        /// <summary>
+        /// Retrieve user information from database
+        /// </summary>
+        /// <param name="email">Identifier by which user information will be retrieved</param>
+        /// <returns>User information</returns>
         Task<UserInfo> GetUserInfo(string email);
 
     }

QRBeeApi/Services/IQRBeeAPI.cs

@@ -4,8 +4,16 @@ using QRBee.Core.Data;
 
 namespace QRBee.Api.Services
 {
+    /// <summary>
+    /// QRBeeAPI interface
+    /// </summary>
     public interface IQRBeeAPI
     {
+        /// <summary>
+        /// Handles Registration request
+        /// </summary>
+        /// <param name="value">Registration request</param>
+        /// <returns>Registration response</returns>
         Task<RegistrationResponse> Register(RegistrationRequest value);
 
     }

QRBeeApi/Services/QRBeeAPI.cs

@@ -6,6 +6,9 @@ using QRBee.Core.Data;
 
 namespace QRBee.Api.Services
 {
+    /// <summary>
+    /// Implementation of <see href="IQRBeeAPI"/>
+    /// </summary>
     public class QRBeeAPI: IQRBeeAPI
     {
         private readonly IStorage _storage;

QRBeeApi/WeatherForecast.cs

@@ -1,13 +0,0 @@
-namespace QRBeeApi
-{
-    public class WeatherForecast
-    {
-        public DateTime Date { get; set; }
-
-        public int TemperatureC { get; set; }
-
-        public int TemperatureF => 32 + (int)(TemperatureC / 0.5556);
-
-        public string? Summary { get; set; }
-    }
-}